Quote:
Originally Posted by Malek@MRF
A lot of that torsional rigidity comes from unitizing the rear axle carrier. When rubber bushed, it does not act as a stiffening bridge, but when unitized the entire axle carrier becomes a unibody brace.
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^^^this^^^
Is this the reason why its made out of steel?
I myself find it odd, that in 2014 BMW is not making rear sub-frames out of Aluminium
As far as i know, no other manufacture is rocking this set up. Its either expensive chunk of Aluminium or hard to mold, weld together